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Collapsible loess area highway reinforced bridgehead roadbed and construction method

A technology for collapsible loess and highways, applied in infrastructure engineering, roads, roads, etc., can solve problems such as bridge head jumping, achieve the effects of reducing poor stiffness, enhancing bearing capacity, and improving modulus of resilience

Active Publication Date: 2020-08-18
WUHAN UNIV OF TECH
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  • Claims
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Problems solved by technology

[0005] The invention provides a highway reinforced bridgehead subgrade in collapsible loess areas and its construction method, which is used to solve the problem of "bridge head jumping" caused by uneven settlement of expressway bridgehead subgrades in collapsible loess areas in the prior art , and at the same time improve the water stability and frost resistance of the subgrade at the bridge head in the collapsible loess area of ​​Northwest China

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  • Collapsible loess area highway reinforced bridgehead roadbed and construction method

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Embodiment Construction

[0031] The structure and construction method of the embodiment of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The specific structure and construction method are as follows:

[0033] A reinforced bridgehead subgrade of expressway in collapsible loess area, from bottom to top, consists of sand-mixed lime soil pile composite foundation 1, reinforced sand-mixed lime soil cushion layer 2, reinforced sand-mixed lime soil backfill layer 3, anti-seepage geotechnical engineering Membrane 4, graded crushed stone cushion 5 and bridge head slab 6 are composed.

[0034] The lime soil in the sand-mixed lime soil pile composite foundation 1 is lime soil mixed with lime and loess at a volume ratio of 30:70 to form lime soil, and then lime soil and river sand are mixed at a mass ratio of 85:15 to form sand-mixed lime soil, and sand-mixed lime soil is used as the pile body material Fill the pile hole in layers, the compa...

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Abstract

The invention discloses a collapsible loess area highway reinforced bridgehead roadbed and a construction method. The roadbed sequentially comprises a sand-doped lime-soil pile composite foundation, areinforced sand-doped lime-soil mattress layer, a reinforced sand-stone-ash-doped improved loess backfill layer, a composite geomembrane, a graded broken stone hardcore and a bridgehead approach slabfrom bottom to top. According to the sand-doped lime-soil pile composite foundation, sand-doped lime soil serves as a pile body material to be filled into pile holes in a layered mode. The reinforcedsand-doped lime-soil mattress layer is formed by mixing river sand, lime and loess in proportion to form a filler; bidirectional geogrids are evenly laid at the vertical interval of 0.2 m for reinforcement, the reinforced sand-gravel-ash-doped improved loess backfill layer is formed by mixing river sand, lime and loess in proportion to form filler, and bidirectional geogrids are evenly laid at the vertical interval of 0.6 m in the filling process. The bridgehead roadbed is high in compression resistance, tensile strength, shearing strength and stability, the problem of 'bridgehead bump' caused by differential settlement and deformation of the bridgehead roadbed can be eliminated to the maximum extent, and meanwhile, the water stability and the frost resistance of the bridgehead roadbed are enhanced.

Description

technical field [0001] The invention relates to the technical field of special expressway subgrades, in particular to a reinforced bridgehead subgrade of expressways in collapsible loess areas and a construction method. Background technique [0002] With the rapid economic development and increasing traffic volume in western my country, the scale and quantity of high-grade highways in the collapsible loess areas of Northwest China are increasing day by day. In Northwest China, most of the newly accumulated loess and the Neo-Pleistocene loess and paleosol are collapsible loess. The thickness of collapsible loess in some areas is relatively thick, and the collapsibility grade is severe to very serious. The collapsible loess is a kind of porous Quaternary sediment with columnar joints formed under dry climate conditions, and it will produce large subsidence after soaking in water. At the same time, the bridge abutment of the expressway is generally high, and the backfill soil...

Claims

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Application Information

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IPC IPC(8): E01C3/00E01C3/06E01C3/04E02D3/08E02D3/00
CPCE01C3/00E01C3/04E01C3/06E02D3/005E02D3/08
Inventor 何雄君杜阳何佳蔡旺朱安东仵卫伟曾志远周慧东刘小武
Owner WUHAN UNIV OF TECH
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